Preheat oven to 350°. In a large skillet, cook and stir sausages over medium heat until browned, 6-8 minutes. Remove with a slotted spoon to a greased 11x7-in. baking dish.
In same skillet, cook and stir onion and peppers over medium heat until tender, 5-6 minutes. Sprinkle over sausages. Whisk together eggs, cream and hot sauce; pour over top. Bake, uncovered, until golden brown and set, 35-40 minutes. Serve with toasted rye bread.
Make-Ahead: Refrigerate, covered, several hours or overnight. To use, preheat oven to 350°. Remove casserole from refrigerator while oven heats. Bake as directed.